package com.cuijq.eduservice.service.impl;

import com.alibaba.excel.EasyExcel;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.cuijq.eduservice.entity.EduSubject;
import com.cuijq.eduservice.entity.excel.SubjectData;
import com.cuijq.eduservice.entity.subject.OneSubject;
import com.cuijq.eduservice.entity.subject.TwoSubject;
import com.cuijq.eduservice.listener.SubjectExcelListener;
import com.cuijq.eduservice.mapper.EduSubjectMapper;
import com.cuijq.eduservice.service.EduSubjectService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

/**
 * <p>
 * 课程科目 服务实现类
 * </p>
 *
 * @author testjava
 * @since 2021-05-09
 */
@Service
public class EduSubjectServiceImpl extends ServiceImpl<EduSubjectMapper, EduSubject> implements EduSubjectService {

  //添加课程分类
  @Override
  public void saveSubject(MultipartFile file, EduSubjectService subjectService) {
    try {
      //文件输入流
      InputStream in = file.getInputStream();
      //调用方法进行读取
      EasyExcel.read(in, SubjectData.class, new SubjectExcelListener(subjectService)).sheet().doRead();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }


  //课程分类列表（树形）
  @Override
  public List<OneSubject> getAllOneTwoSubject() {
    //1 查询所有一级分类  parentid = 0
    QueryWrapper<EduSubject> wrapperOne = new QueryWrapper<>();
    wrapperOne.eq("parent_id", "0");
    List<EduSubject> oneSubjectList = baseMapper.selectList(wrapperOne);

    //2 查询所有二级分类  parentid != 0
    QueryWrapper<EduSubject> wrapperTwo = new QueryWrapper<>();
    wrapperTwo.ne("parent_id", "0");
    List<EduSubject> twoSubjectList = baseMapper.selectList(wrapperTwo);

    //创建list集合，用于存储最终封装数据
    List<OneSubject> finalSubjectList = new ArrayList<>();

    //3 封装一级分类
    //查询出来所有的一级分类list集合遍历，得到每个一级分类对象，获取每个一级分类对象值，
    //封装到要求的list集合里面 List<OneSubject> finalSubjectList
    for (int i = 0; i < oneSubjectList.size(); i++) { //遍历oneSubjectList集合
      //得到oneSubjectList每个eduSubject对象
      EduSubject eduSubject = oneSubjectList.get(i);
      //把eduSubject里面值获取出来，放到OneSubject对象里面
      OneSubject oneSubject = new OneSubject();
//            oneSubject.setId(eduSubject.getId());
//            oneSubject.setTitle(eduSubject.getTitle());
      //eduSubject值复制到对应oneSubject对象里面
      BeanUtils.copyProperties(eduSubject, oneSubject);
      //多个OneSubject放到finalSubjectList里面
      finalSubjectList.add(oneSubject);

      //在一级分类循环遍历查询所有的二级分类
      //创建list集合封装每个一级分类的二级分类
      List<TwoSubject> twoFinalSubjectList = new ArrayList<>();
      //遍历二级分类list集合
      for (int m = 0; m < twoSubjectList.size(); m++) {
        //获取每个二级分类
        EduSubject tSubject = twoSubjectList.get(m);
        //判断二级分类parentid和一级分类id是否一样
        if (tSubject.getParentId().equals(eduSubject.getId())) {
          //把tSubject值复制到TwoSubject里面，放到twoFinalSubjectList里面
          TwoSubject twoSubject = new TwoSubject();
          BeanUtils.copyProperties(tSubject, twoSubject);
          twoFinalSubjectList.add(twoSubject);
        }
      }
      //把一级下面所有二级分类放到一级分类里面
      oneSubject.setChildren(twoFinalSubjectList);
    }
    return finalSubjectList;
  }
}
